JP3705210B2 - Percussion head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a percussion instrument head made of a synthetic resin film.
[0002]
[Prior art]
Among the heads for percussion instruments used in percussion instruments such as snare drums and stretched on the open end face of the trunk body, the heads made of synthetic resin are cheaper and more mass-productive than the heads made of natural leather. However, since it is hardly affected by environmental temperature changes, humidity, etc., the pitch and tone of the sound are difficult to change, and the sound quality is hard.
[0003]
In the case of a synthetic resin drum head, one composed of one ply or two plies is generally used. A head composed of one ply has a feature that it has a high response to a high-band component sound. On the other hand, since a high sound remains, a sound that is as good as natural leather cannot be obtained. In particular, in the field of marching drums where the crispness of sound is important, the overtones grow too much and the user adjusts them by attaching a mute to the head. The same is true for timpani heads, and the overtones grow too long, making the sense of pitch unclear.
[0004]
The head composed of two plies is: (1) a simple superposition of two synthetic resin films, (2) only the outer peripheral part of the film is adhered to each other with an adhesive, and the central part is adhered to each other, 3) There are three types, one in which the entire surface of the film is bonded to each other with an adhesive. As a variation, the sound quality is changed by painting the surface. The one that the two films of (1) are simply overlapped and the one that adheres only the outer periphery of (2) is relatively good in sound but has a problem with the response of the high-band component sound . In the case where the entire surface of (3) is bonded, the adhesive strength of the adhesive is too strong, so the difference between the one-ply and the two-ply is unclear, and it can be expected that the film layer is displaced due to vibration. Can not. For this reason, high-frequency component sounds remain as in the case of the 1-ply head, and a sharp sound cannot be obtained.
[0005]
Therefore, in order to cut overtones and obtain a crisp sound with a sense of pitch, for example, a musical instrument head and a method for manufacturing the same disclosed in JP-A-10-301560 have been proposed. In this musical instrument head and its manufacturing method, the surface of a synthetic resin sheet is formed into a rough surface by grinding with a cloth file, and the front and back surfaces thereof are covered with an epoxy resin to form a substantially flat and uniform contact surface. This is a musical instrument head. According to such a musical instrument head, it can resonate better, has a sufficient overtone or overtone compared to a conventional head, and a shadow is generated on the surface, so that an appearance approximate to a real skin can be given. There are advantages.
[0006]
[Problems to be solved by the invention]
However, the musical instrument head and the method for manufacturing the same disclosed in Japanese Patent Laid-Open No. 10-301560 are mechanically ground with a cloth file to form a mat (rough surface). As a result, it is difficult to form a uniform rough surface due to irregularities in the size and depth of the irregularities, resulting in a variation in sound quality and a problem that a stable quality instrument head cannot be manufactured.
[0007]
The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to employ a chemical etching instead of mechanical grinding to provide a rough surface having a substantially uniform size. It is to provide a head for a percussion instrument that can be formed and has good sound quality.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a head for a percussion instrument that is made of a synthetic resin film and is stretched on the opening end surface of a trunk body, and at least one of the front and back surfaces of the synthetic resin film is chemically treated. It is formed on the rough surface by etching.
Further, in the present invention, a rough surface is formed by applying a caustic aqueous solution to the synthetic resin film or immersing the film in the caustic aqueous solution and performing chemical etching.
Moreover, this invention sets the depth of the unevenness | corrugation formed in the said synthetic resin film by chemical etching to 1.5-3 micrometers.
In the present invention, the resin is coated on the front and back surfaces of the synthetic resin film after chemical etching.
[0009]
In the present invention, the chemical etching is formed into a rough surface by chemically dissolving at least one of the front and back surfaces of the synthetic resin film with an etching solution. For example, when the synthetic resin film is a polyester fiber film (PET film), a caustic aqueous solution is used. When the entire surface of the film is treated, hydrolysis proceeds from the fiber surface and the surface dissolves. And become rough. Since dissolution by this hydrolysis is carried out substantially uniformly over the entire surface of the film, a rough surface having substantially constant irregularities can be obtained. Moreover, since the flexibility of a film will increase compared with a flat thing when it forms in a rough surface, a harmonic sound is cut and a crisp sound with a feeling of a pitch is obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
1 is a cross-sectional view showing an embodiment of a head for a percussion instrument according to the present invention, FIG. 2 is a bottom view of the head for the percussion instrument, FIG. 3 is an enlarged cross-sectional view of a portion A in FIG. It is an expanded sectional view of the B section. In these drawings, the head for a percussion instrument generally indicated by reference numeral 1 is formed by a synthetic resin film 2 formed in a disk shape of a predetermined size, and the outer peripheral edge of the film 2 is a ring-shaped head. It is inserted into the annular groove 4 of the frame 3 and fixed with an adhesive 5. Further, the front and back surfaces of the synthetic resin film 2 are mat-like by chemical etching, and a large number of minute irregularities 6 are randomly formed. The size of the unevenness 6 is substantially constant.
[0011]
As the synthetic resin film 2, for example, a PET film having a thickness of about 50 μm to 350 μm, a polyethylene terephthalate film, or the like is used.
[0012]
The chemical etching of the synthetic resin film 2 uses a caustic aqueous solution when the film 2 is a PET film. When a PET film is immersed in a caustic alkaline aqueous solution, hydrolysis proceeds from the fiber surface, and the surface is sequentially decomposed, whereby irregularities 6 are generated and a mat can be formed. Such treatment is called weight loss processing and is usually used as one of processing methods for improving the texture of polyester fibers. When this dissolution mechanism is applied to a PET film, an etching surface is formed with a reduction in weight.
[0013]
Such a chemical etching method applies an etching solution to the film when only one side is etched, and if both sides are etched, the film should be immersed in the solution. Can be processed substantially uniformly. Therefore, it is possible to form a mat-like surface in which the size of the irregularities 6 is substantially constant, and it is possible to manufacture a head for a percussion instrument that is rich in flexibility like natural leather. Also, in terms of sound quality, the sound quality is soft like natural leather, and the high-band component sound disappears quickly, so that a crisp sound with a sense of pitch can be obtained. Furthermore, the balance from the rise of sound to attenuation is also good.
[0014]
However, since the chemical etching of the synthetic resin film 2 is based on a delicate balance of caustic agent, solution concentration, and processing time, this balance is lost due to the difficulty of productivity and processing steps. Since the weight loss proceeds before the formation of the etching and the film is finally melted, it must be performed under strict control. However, the formed etching shape is dense but has irregular continuity like the sea surface, which is much preferable compared to other processing methods using cloth files. That is, it is possible to obtain a rough surface in which the unevenness 6 is substantially uniform. The depth of the irregularities 6 is preferably about 1.5 to 3 μm.
[0015]
In particular, when grinding with a cloth file, if the recess is too large or too deep, the strength (tension) of the film will decrease, and there is a risk of stress concentrating on that portion and breaking when supporting tension with a predetermined tension. However, in the case of chemical etching, since the unevenness 6 has a substantially uniform size, concentration of stress during support tension can be prevented.
[0016]
Further, when the surface side is formed to be a rough surface, a shadow is generated by the unevenness 6 so that an appearance similar to natural leather can be given.
[0017]
FIG. 4 is a cross-sectional view of a main part showing another embodiment of a head for a percussion instrument according to the present invention. In this embodiment, only the surface of the synthetic resin film 20 is subjected to chemical etching to form the irregularities 6. In addition, after chemical etching, the front and back surfaces are coated with a resin 21 such as an epoxy resin. The chemical etching is performed by applying a chemical such as a caustic aqueous solution to the surface of the synthetic resin film 2.
[0018]
Also in the head for a percussion instrument made of such a synthetic resin film 20, depending on the thickness of the film itself and the size of the projections and depressions 6, it is flexible and soft and crisp, like the head 1 for a percussion instrument of the above-described embodiment. A good sound is obtained.
[0019]
【Example】
As a practical product, a 300 μm thick PET film was immersed in a caustic aqueous solution to chemically etch the surface, washed, and then dried with warm air. As a result, the surface was dissolved and the weight was reduced to obtain a 260 μm film. The depth of the unevenness on the surface was 1.5 to 3 μm.
[0020]
In the above-described embodiment, an example in which only the surface of the synthetic resin film 2 is subjected to chemical etching and an example in which chemical etching is performed on the front and back surfaces are shown. It may be a thing.
[0021]
【The invention's effect】
As described above, the head for a percussion instrument according to the present invention is formed in a mat shape by chemical etching on at least one of the front and back surfaces. Can be provided. Therefore, the sound quality is soft like natural leather, and the high-band component sound disappears quickly, so that a crisp sound with a sense of pitch can be obtained. In addition, chemical etching can form irregularities that are roughly uniform in size compared to mechanical grinding, so there is little variation in sound quality, and there is a good balance between the rise and decay of the sound, and a stable quality percussion instrument. The head can be manufactured and provided.
Further, when chemical etching is performed on the surface side, an appearance similar to natural leather can be imparted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a head for a percussion instrument according to the present invention.
FIG. 2 is a plan view of the head for the percussion instrument.
FIG. 3 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 4 is a cross-sectional view of a main part showing another embodiment of a head for a percussion instrument according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Head for percussion instruments, 2 ... Synthetic resin film, 3 ... Head frame, 5 ... Adhesive, 6 ... Concavity and convexity, 20 ... Synthetic resin film, 21 ... Epoxy resin.

Claims (4)

In a head for a percussion instrument made of a synthetic resin film and stretched on the opening end surface of the trunk body,
A head for a percussion instrument, wherein at least one of the front and back surfaces of the synthetic resin film is formed into a rough surface by chemical etching.   2. The percussion instrument according to claim 1, wherein the rough surface of the synthetic resin film is formed by applying a caustic aqueous solution to the film or immersing the film in the caustic aqueous solution and performing chemical etching. For head. The head for a percussion instrument according to claim 1, wherein the depth of the irregularities formed in the synthetic resin film by chemical etching is 1.5 to 3 µm. 2. The head for a percussion instrument according to claim 1, wherein a resin is coated on the front and back surfaces of the synthetic resin film after chemical etching.

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